Transcript Electromagnetism_Notesx

Electromagnetism
Student Instruction 1
Before you begin reading the ‘Electricity’ notes,
make an inside fold in your science notebook
and write the title ‘Electromagnets’ . Make sure
you update your Table of Contents and page
numbers. Now copy the Objective and Essential
Question. Be sure to complete all of the
Student Instructions, when prompted, in your
notebook.
Electromagnetism
Objective:
After hands on exploration, students
will identify, classify, and document
the characteristics of an
electromagnet by the end of the
lesson.
Electromagnetism
Essential Question:
How do you make an
electromagnet?
Hans Christian Orested
Hans Christian Oersted was a
Danish physicist who discovered the
connection between electricity and
magnetism. On April 21, 1820, the
42 years old Oersted demonstrated
his famous experiment, where he
passed electric current through a
wire, which caused a nearby
magnetic compass needle to move.
His discovery is called
Electromagnetism
Electromagnetism
When electric current flows
through a wire, a magnetic
field is created all around
the wire. This will cause the
wire to behave like a
magnet and attract objects
made out of iron, steel,
nickel or cobalt .
Building an Electromagnet
To build an simple series
electromagnet, you need a battery
(source ), a long insulated thin wire
(path), and an iron nail or rivet
(receiver). Wrap the wire tightly
around the nail or rivet, leaving
enough wire at both ends to attach
to the battery. Once the wire is
attached to the battery, the nail/rivet
becomes a temporary magnet.
Student Instruction 2
Draw an illustration (on a separate ½ piece of
unlined paper), of a simple series electromagnet
with 1 source, 1 path, 1 switch and 1 rivet . Be
sure to include captions of the relevant parts.
Student Instruction 3
Draw a schematic (on a separate ½ piece of
unlined paper), of a simple series
electromagnet with 1 source, 1 path, 1 switch
and 1 rivet . Be sure to include a key.
Temporary Magnet
The electro magnet becomes
a temporary magnet. The
core (rivet) will retain its
magnetic force as long as the
current flows through the
circuit. If the circuit is
disconnected or switched off,
the magnetic field ends.
Closed switch
Open switch
Michael Faraday
Michael Faraday was
an English scientist
most famous for his
discovery of
Electromagnetic
Induction.
Student Instruction 4
Write 3 facts not mentioned in the notes about
Hans Christian Oersted. Also get a picture of
him for your note book.
Student Instruction 5
Write 3 facts not mentioned in the notes about
Michael Faraday. Also get a picture of him for
your note book.
Electromagnetic Induction
In 1831, Michael Faraday conducted an
experiment that proved that electric
current could be produced from magnets
by pushing a magnet through a coil of
wire. This is called Electromagnetic
Induction. Induction comes from the
word Induce, which means to bring about
or cause; not spontaneous.
Electromagnetic Induction Continued
Faraday also discovered that the
tightness of the coil and the speed that
the magnet moves affect the strength
of the electromagnet. The tighter the
coil and the faster the magnet moves
both make the electric current
stronger.
Electromagnetism
Electromagnets are everywhere. We use
them when we ring a door bell, turn on a
television and blow-dry our hair. They
can be found in most household
appliances. They are also used in
industrial machines to move or lift heavy
objects. What may surprise some people
is that electromagnetism is people. It is
what holds our atoms together.
Student Instruction 6
Use a simple series circuit first, then an
advance series circuit to see if the number of
sources affects the strength of the
electromagnet. Record your results.
Student Instruction 7
Conduct an experiment to see if the tightness
of the coil affects the strength of the
electromagnet. Use an advance series circuit
and record your results.
Resources
• www.famousscientists.org/hans-christianoersted/
• https://app.discoveryeducation.com
(Electromagnets)
• https://app.discoveryeducation.com
(Electricity from Magnets)
• FOSS Science Stories: Magnetism and
Electricity